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ReduceLoadWidth unconditionally drops extensions from loads. Limit it to the case when all of the bits the extension would otherwise produce are dropped by the shrink. It would be possible to shrink the load in more cases by merging the extensions, but this isn't trivial and a very rare case. I left a TODO for that case. Fixes PR16551. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185755 91177308-0d34-0410-b5e6-96231b3b80d8
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